Introduce LabeledOption and RangeValues named types

Replace all tuple[str, str] annotations with purpose-specific names:
- LabeledOption = tuple[str, str] for (value, label) pairs used in
  FilterChoice, FilterSelect params, _modifier_options, _find_label,
  and _extract_labeled.
- RangeValues(min, max) NamedTuple for _parse_range return values,
  making the two fields self-documenting at every call site.

Export LabeledOption from common.components alongside SearchSelectOption.
Document the "name compound types explicitly" convention in CLAUDE.md.

https://claude.ai/code/session_01EyAJcMoDktLrY9tSbdHViA

common/components/__init__.py

@@ -42,6 +42,7 @@ from common.components.primitives import (
 )
 from common.components.search_select import (
     FilterSelect,
+    LabeledOption,
     SearchSelect,
     SearchSelectOption,
     searchselect_selected,
@@ -87,6 +88,7 @@ __all__ = [
     "PopoverTruncated",
     "SearchField",
     "FilterSelect",
+    "LabeledOption",
     "SearchSelect",
     "SearchSelectOption",
     "searchselect_selected",